The WEBC2 malware family is designed to retrieve a Web page from a pre-determined C2 server. It expects the Web page to contain special HTML tags; the backdoor will attempt to interpret the data between the tags as commands. The WEBC2-YAHOO variant enters a loop where every ten minutes it attempts to download a web page that may contain an encoded URL. The encoded URL will be found in the pages returned inside an attribute named 'sb' or 'ex' within a tag named 'yahoo'. The embedded link can direct the malware to download and execute files.
Created: 2026-02-23
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